From 3dcf4140386b3e63955790d87093521f021bedee Mon Sep 17 00:00:00 2001
From: Stephen Hemminger <shemminger@vyatta.com>
Date: Fri, 16 Mar 2012 15:41:29 -0700
Subject: Add option to search for device based on pci-id

To support case where device is not in kernel (userspace networking)
need a method for finding device by pci-id. Biosdevname was already
building the table, this just adds an alternative lookup algorithm.
---
 src/bios_dev_name.c  | 43 +++++++++++++++++++++++++++++++++----------
 src/bios_dev_name.h  |  2 +-
 src/bios_device.c    | 32 +++++++++++++++++++++++++++++---
 src/libbiosdevname.h |  1 +
 src/pci.c            |  2 +-
 src/pci.h            |  1 +
 6 files changed, 66 insertions(+), 15 deletions(-)

diff --git a/src/bios_dev_name.c b/src/bios_dev_name.c
index dd47fc3..ae994ab 100644
--- a/src/bios_dev_name.c
+++ b/src/bios_dev_name.c
@@ -24,6 +24,7 @@ static void usage(void)
 	fprintf(stderr, "Usage:  biosdevname [options] [args]...\n");
 	fprintf(stderr, " Options:\n");
 	fprintf(stderr, "   -i        or --interface           treat [args] as ethernet devs\n");
+	fprintf(stderr, "   --pci-spec                         treat [args] as PCI specification\n");
 	fprintf(stderr, "   -d        or --debug               enable debugging\n");
 	fprintf(stderr, "   --policy [physical | all_ethN ]\n");
 	fprintf(stderr, "   --prefix [string]                  string use for embedded NICs (default='em')\n");
@@ -36,6 +37,12 @@ static void usage(void)
 	fprintf(stderr, " You must be root to run this, as it must read from /dev/mem.\n");
 }
 
+static void conflict(void)
+{
+	fprintf(stderr, "can't use both interface and pci options\n");
+	exit(1);
+}
+
 static int
 set_policy(const char *arg)
 {
@@ -65,6 +72,7 @@ parse_opts(int argc, char **argv)
 			{"nopirq",	      no_argument, 0, 'x'},
 			{"invm",              no_argument, 0, 'V'},
 			{"smbios",	required_argument, 0, 's'},
+			{"pci-spec",          no_argument, 0, 'S'},
 			{0, 0, 0, 0}
 		};
 		c = getopt_long(argc, argv,
@@ -77,8 +85,15 @@ parse_opts(int argc, char **argv)
 			opts.debug = 1;
 			break;
 		case 'i':
+			if (opts.usepci)
+				conflict();
 			opts.interface = 1;
 			break;
+		case 'S':
+			if (opts.interface)
+				conflict();
+			opts.usepci = 1;
+			break;
 		case 'p':
 			opts.namingpolicy = set_policy(optarg);
 			break;
@@ -172,21 +187,29 @@ int main(int argc, char *argv[])
 		goto out_cleanup;
 	}
 
-
-	if (!opts.interface) {
+	if (opts.interface) {
+		for (i=0; i<opts.argc; i++) {
+			name = kern_to_bios(cookie, opts.argv[i]);
+			if (name)
+				printf("%s\n", name);
+			else
+				rc |= 2; /* one or more given devices weren't found */
+		}
+	} else if(opts.usepci) {
+		for (i=0; i<opts.argc; i++) {
+			name = pci_to_bios(cookie, opts.argv[i]);
+			if (name)
+				printf("%s\n", name);
+			else
+				rc |= 2;
+		}
+	} else {
 		fprintf(stderr, "Unknown device type, try passing an option like -i\n");
 		rc = 1;
 		goto out_usage;
 	}
 
-	for (i=0; i<opts.argc; i++) {
-		name = kern_to_bios(cookie, opts.argv[i]);
-		if (name) {
-			printf("%s\n", name);
-		}
-		else
-			rc |= 2; /* one or more given devices weren't found */
-	}
+
 	goto out_cleanup;
 
  out_usage:
diff --git a/src/bios_dev_name.h b/src/bios_dev_name.h
index 636c5e1..98197d4 100644
--- a/src/bios_dev_name.h
+++ b/src/bios_dev_name.h
@@ -15,6 +15,6 @@ struct bios_dev_name_opts {
 	const char *prefix;
 	unsigned int debug:1;
 	unsigned int interface:1;
+	unsigned int usepci:1;
 };
-
 #endif /* GLUE_H_INCLUDED */
diff --git a/src/bios_device.c b/src/bios_device.c
index 24b0a77..e04c5b9 100644
--- a/src/bios_device.c
+++ b/src/bios_device.c
@@ -89,6 +89,33 @@ char * kern_to_bios(void *cookie,
 	return NULL;
 }
 
+char * pci_to_bios(void *cookie, const char *s)
+{
+	struct libbiosdevname_state *state = cookie;
+	struct bios_device *dev;
+	int domain=0, bus=0, device=0, func=0;
+
+	if (parse_pci_name(s, &domain, &bus, &device, &func)) {
+		fprintf(stderr, "%s is not a valid pci device name\n", s);
+		return NULL;
+	}
+
+	if (!state)
+		return NULL;
+
+	list_for_each_entry(dev, &state->bios_devices, node) {
+		const struct pci_device *pci = dev->pcidev;
+
+		if(pci &&
+		   pci->pci_dev->domain == domain &&
+		   pci->pci_dev->bus == bus &&
+		   pci->pci_dev->dev == device &&
+		   pci->pci_dev->func == func)
+			return dev->bios_name;
+	}
+	return NULL;
+}
+
 void unparse_bios_device_list(void *cookie)
 {
 	struct libbiosdevname_state *state = cookie;
@@ -220,8 +247,6 @@ static void match_eth_and_pci_devs(struct libbiosdevname_state *state)
 
 		unparse_pci_name(pci_name, sizeof(pci_name), p->pci_dev);
 		n = find_net_device_by_bus_info(state, pci_name);
-		if (!n)
-			continue;
 
 		b = malloc(sizeof(*b));
 		if (!b)
@@ -230,7 +255,8 @@ static void match_eth_and_pci_devs(struct libbiosdevname_state *state)
 		INIT_LIST_HEAD(&b->node);
 		b->pcidev = p;
 		b->netdev = n;
-		claim_netdev(b->netdev);
+		if (n)
+			claim_netdev(b->netdev);
 		list_add(&b->node, &state->bios_devices);
 	}
 }
diff --git a/src/libbiosdevname.h b/src/libbiosdevname.h
index 37eccb1..505b234 100644
--- a/src/libbiosdevname.h
+++ b/src/libbiosdevname.h
@@ -14,6 +14,7 @@ enum namingpolicy {
 extern void * setup_bios_devices(int namingpolicy, const char *prefix);
 extern void cleanup_bios_devices(void *cookie);
 extern char * kern_to_bios(void *cookie, const char *devname);
+extern char * pci_to_bios(void *cookie, const char *spec);
 extern void unparse_bios_devices(void *cookie);
 extern void unparse_bios_device_by_name(void *cookie, const char *name);
 
diff --git a/src/pci.c b/src/pci.c
index 9b9703a..31b4457 100644
--- a/src/pci.c
+++ b/src/pci.c
@@ -365,7 +365,7 @@ static int read_virtfn_index(unsigned int *index, const struct pci_dev *pdev)
 	return rc;
 }
 
-static int parse_pci_name(const char *s, int *domain, int *bus, int *dev, int *func)
+int parse_pci_name(const char *s, int *domain, int *bus, int *dev, int *func)
 {
 	int err;
 /* The domain part was added in 2.6 kernels.  Test for that first. */
diff --git a/src/pci.h b/src/pci.h
index 374f7b3..9c21d5c 100644
--- a/src/pci.h
+++ b/src/pci.h
@@ -57,6 +57,7 @@ extern void free_pci_devices(struct libbiosdevname_state *state);
 extern struct pci_device * find_dev_by_pci(const struct libbiosdevname_state *state, const struct pci_dev *p);
 extern struct pci_device * find_pci_dev_by_pci_addr(const struct libbiosdevname_state *state, const int domain, const int bus, const int device, const int func);
 extern struct pci_device * find_dev_by_pci_name(const struct libbiosdevname_state *state, const char *s);
+extern int parse_pci_name(const char *s, int *domain, int *bus, int *dev, int *func);
 extern int unparse_pci_device(char *buf, const int size, const struct pci_device *p);
 extern int unparse_pci_name(char *buf, int size, const struct pci_dev *pdev);
 
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